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  <title>First Observation of Heavy Baryons &#931;<sub>b</sub>and &#931;<sub>b</sub><sup>*</sup></title>
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<h1>First Observation of Heavy Baryons &#931;<sub>b</sub>and &#931;<sub>b</sub><sup>*</sup></h1>
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 style="color: rgb(0, 0, 102); margin-left: 80px; font-weight: bold;">
<div style="text-align: left; margin-left: 80px;"><big><span
 style="font-style: italic;">This web page summarizes the results of
the search for the new heavy baryons &#931;</span><sub
 style="font-style: italic;">b</sub><span style="font-style: italic;">
and &#931;</span><sub style="font-style: italic;">b</sub><sup
 style="font-style: italic;">*</sup><span style="font-style: italic;">
based upon 1.1 fb</span><sup style="font-style: italic;">-1</sup><span
 style="font-style: italic;"> of data.
</span><br style="font-style: italic;">
<span style="font-style: italic;">The results were initally blessed in the <i>B</i>
group meeting on Sept. 21, 2006.  Updates to these results were blessed
in the <i>B</i> group meetings on Dec. 14, 2006; Feb. 15, 2007; and
May 10, 2007.

Using the fully reconstructed decay mode</span> </big></div>
<div style="text-align: center;"><big><big><br>
&#931;<sub>b</sub><sup>(*)&plusmn;</sup>&#8594;&#923;<sub>b</sub><sup>0</sup>&#960;<sup>&plusmn;</sup>;
&nbsp; &nbsp; &#923;<sub>b</sub><sup>0</sup>&#8594;&#923;<sub>c</sub><sup>+</sup>&#960;<sup>-</sup>;&nbsp;&nbsp;&nbsp;&nbsp;
&#923;<sub>c</sub><sup>+</sup>&#8594;pK<sup>-</sup>&#960;<sup>+</sup>
<br>
&nbsp;<br>
</big></big></div>
<div style="margin-left: 80px;"><big><big><span
 style="font-style: italic;">we measure:</span></big></big></div>
<ul style="margin-left: 80px; font-weight: bold;">
  <big> <big> 
  <li>m(&#931;<sub>b</sub><sup>+</sup>)&nbsp; 
= 5807.8<sup>+2.0</sup><sub>-2.2</sub>(stat.) &plusmn;
1.7(syst.) MeV/c<sup>2</sup> </li>
  <li>m(&#931;<sub>b</sub>&macr;) 
= 5815.2 &plusmn; 1.0(stat.)
&plusmn; 1.7(syst.) MeV/c<sup>2&nbsp;</sup> </li>
  <li>m(&#931;<sub>b</sub><sup>*+</sup>) 
= 5829.0<sup>+1.6</sup><sub>-1.8</sub>(stat.)
<sup>+1.7</sup><sub>-1.8</sub>(syst.) MeV/c<sup>2</sup> </li>
  <li>m(&#931;<sub>b</sub><sup>*&macr;</sup>) 
= 5836.4<sup>+2.0</sup><sub>-1.8</sub>(stat.)
<sup>+1.8</sup><sub>-1.7</sub>(syst.) MeV/c<sup>2</sup> </li>
  </big></big>
</ul>


<div style="margin-left: 80px;"><big><big><span
 style="font-style: italic;">The probability for the background
to produce this signal is below the 5&#963; level.</span></big></big></div>
<br><br>
<div style="text-align: center;"><big><big><img alt=""
 src="BlessedPlots/SigmaB_Points_SmallRange.gif"
 style="border: 3px solid ; width: 750px; height: 901px;"><br>
<br>
</big></big></div>
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<h3>A more detailed summary of the
results can be found
here:&nbsp;<a href="cdf8523_sigb_pubnote.pdf">pdf</a></h3>
<h3>Below are the eps and gif versions of all
figures meant for downloads. </h3>
<ul>
  <li> PRL Figure: <big><span style="font-style: italic;">&#931;</span><sub
 style="font-style: italic;">b</sub></big> mass plot in MeV/c<sup>2</sup>:
[<a href="PRL_combined_mev.eps">eps</a>][<a href="PRL_combined_mev.gif">gif</a>]
  <li> Figure 1: Fit with the <big><span style="font-style: italic;">&#931;</span><sub
 style="font-style: italic;">b</sub></big>hypothesis
(full range in Q):
histogram [<a href="BlessedPlots/SigmaB_Histogram_FullRange.eps">eps</a>]
[<a href="BlessedPlots/SigmaB_Histogram_FullRange.gif">gif</a>];&nbsp;
points [<a href="BlessedPlots/SigmaB_Points_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/SigmaB_Points_FullRange.gif">gif</a>]<br>
  </li>
  <li> Figure 2: Fit with the <big><span style="font-style: italic;">&#931;</span><sub
 style="font-style: italic;">b</sub></big>hypothesis (small range in
Q): histogram [<a href="BlessedPlots/SigmaB_Histogram_SmallRange.eps">eps</a>]
[<a href="BlessedPlots/SigmaB_Histogram_SmallRange.gif">gif</a>];&nbsp;
points [<a href="BlessedPlots/SigmaB_Points_SmallRange.eps">eps</a>] [<a
 href="BlessedPlots/SigmaB_Points_SmallRange.gif">gif</a>]<br>
  </li>
  <li> Figure 3: &#923;<sub>b</sub><sup>0</sup>&#8594;&#923;<sub>c</sub><sup>+</sup>&#960;<sup>-</sup>
reconstructed mass: [<a href="BaselineBlindedData_massFit.eps">eps</a>]
[<a href="BaselineBlindedData_massFit.gif">gif</a>] </li>
  <li> Figure 4: Blinded Q distribution: [<a
 href="BlessedPlots/Blinded_Points_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/Blinded_Points_FullRange.gif">gif</a>]<br>
  </li>
  <li><a =""> Figure 5: Unblinded Q distribution: [</a><a
 href="BlessedPlots/UnblindedBkgs_Points_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/UnblindedBkgs_Points_FullRange.gif">gif</a>] </li>
  <li> Figure 6: Fit with the null hypothesis: histograms [<a
 href="BlessedPlots/NoPeakFit_Histogram_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/NoPeakFit_Histogram_FullRange.gif">gif</a>], points
[<a href="BlessedPlots/NoPeakFit_Points_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/NoPeakFit_Points_FullRange.gif">gif</a>]<br>
  </li>
  <li> Figure 7: Fit with the two peak hypothesis: histograms [<a
 href="BlessedPlots/OnePeakFit_Histogram_FullRange.eps">eps</a>] [<a
 href="BlessedPlots/OnePeakFit_Histogram_FullRange.gif">gif</a>];&nbsp;
points [<a href="BlessedPlots/OnePeakFit_Points_FullRange.eps">eps</a>][<a
 href="BlessedPlots/OnePeakFit_Points_FullRange.gif">gif</a>]<br>
  </li>
</ul>
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